Addmotor 20" x 4" Bicycle Rim Tape PVC Inner Tube Protector Tire Liner 4PCS | eBay
Amazon.com : MARQUE Bike Tire Liner - Help Prevent Flats and Punctures, Protects Inner Tire Tube with TPU Liner, Works with 24", 26", 27.5", 29", 700C Mountain and Road Bicycle Tires (24-26") :
Mountain Bike Tire Liner, Bicycle Tire Protector Compatible with 24" 26" 29"